Guess it would be embarassing to find yourself hung-up on the chair in a public place. If I wasn't violaing the carry laws (bar location) I would sit there until the place cleared outas much as I could hope for, then call for the manager and explain the situation to him. Maybe good to call the police for help, maybe not.
However, I would never try to clear it from a position/stance where I couldn't see the weapon and how I was "caught". Maybe I would trust a couple of friends with trying to extricate it but pretty much I hope I could swallow my pride and call for some experienced help (like a LEO or friend) rather than a busboy, my inept co-worker, client or lunchdate.